For many years this insect has been popularly known as “the forest tent-caterpillar.” During the past two or three years it has attracted much attention in New Hampshire, Vermont, and New York, from its ravages in maple forests, city or village maple shade trees, and in many orchards. In orchards it has often worked with its near relative, the apple tent-caterpillar (Clisiocampa americana). Every one who critically observes the habits of these two species of caterpillars soon discovers that “the forest tent-caterpillar” is a very misleading name for Clisiocampa disstria, because its caterpillars never make a tent, while the apple tent-caterpillars always do. Several who have seriously discussed these insects recently have felt the necessity of a new popular name for Clisiocampa disstria.